qt5base: fix musl build

This was taken from upstream qt5 and modified a little bit to match
OpenWrt.

Signed-off-by: Hauke Mehrtens <[email protected]>

qt5base: remove dependency to icu

The icu package does not exist in OpenWrt.

Signed-off-by: Hauke Mehrtens <[email protected]>

move qt4 package from Xorg to Video feed

There's some minor changes, especially to seperate
an qt4 from an qt5 installation (Host and target).
Also the x11 support got dropped - framebuffer only.
Some obvious and trivial bug fixes got applied as well,
however, apart from that, it basically is, what it was.

The Xorg feed is totally unmaintained currently,
also the early approach of running an Xserver on
embedded devices - hence the feed's name - thankfully
didn't really become the standard either.

So let's reorganise some of the stuff from the Xorg
feed worth keeping within the new Video feed.

add Qt5 submodule quick1

Qt5Quick1 features QML1 and provides
the QDeclarative* implementations.

Don't confuse that with the QtDeclarative
submodule which provides support for QML2
and exports the QQml* interface (also known
as QtQuick(2)).

QtQuick(2)/QML2 by the way has a hard
dependency on GL, hence without GL support
you're stuck on QtQuick1/QML1.

add Qt5 script

Adding Qt5 base

Crosscompile and package Qt5 (base) and setup an
environment to easily crosscompile and package
other qmake based projects.

Please see the comments within the Makefiles
(Makefile / qmake.mk) for current limitations and
known issues.

Packaged from the "base" submodule herewith are:

 - qt5base-concurrent
 - qt5base-core
 - qt5base-gui
 - qt5base-network
 - qt5base-printSupport
 - qt5base-sql
 - qt5base-test
 - qt5base-widgets
 - qt5base-xml
 - qt5base-plugin-bearer-generic
 - qt5base-plugin-input-evdevkeyboard
 - qt5base-plugin-input-evdevmouse
 - qt5base-plugin-input-evdevtablet
 - qt5base-plugin-input-evdevtouch
 - qt5base-plugin-imageformats-gif
 - qt5base-plugin-imageformats-ico
 - qt5base-plugin-imageformats-jpeg
 - qt5base-plugin-platforms-linuxfb
 - qt5base-plugin-platforms-minimal
 - qt5base-plugin-platforms-offscreen
 - qt5base-plugin-sqldrivers-sqlite
 - qt5base-examples

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